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A. H. KNAPP, OF NEWTON CENTRE, MASSACHUSETTS.

Letters Patent No. 73,905,dated January 28, 1868.

IMPROVED SPRING POE BED-BOTTOMS, CHAIRS, 6to.

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TO ALL WHOM IT MAY CONCERN:

Bc it known that I, A. H. KNAPP, of Newton Centre, in the county of Middlesex, und State of Massachusetts, have invented n new and useful Improvement in Upholstering-Springs; and I do hereby declare that tue following is a full, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawing, forming a part of this specieation, which is a. plan, showing the manner of arranging the wires to form a spring-bottom for beds, chairs, settees, sofas, dto.

The principal advantages secured by its use are, durability of articles so made, and health and comfort while using them.

My invention consists 1n forming springs by bending wires into e succession of triangular or oblong loops, a a, about an inch apart, or varying with the size of the wire, but of a uniform distance apart, es vshown inthe drawings.v The loops of the wires passing either lengthwise or crosswse should b e made a little the smallest, so as to pass through and rest inside of the ones crossing them, as shown atb b; or the loops may be alteruntely large and small, und wmen together, so as terest alternately inside of and around each other, the ends of each springbeing fastened in any obvious manner to the frame it is designed to be used upon, as shown at C CIC, giving sufficient tension to each wire to keep the loops in place.

The dneness of the wires with which they can be constructed, and consequently the ncaa-ness with which they can be placed to each other, and the light pressure with which each spring will yield to and adapt itself to the inequalities of the system, make them very comfortable to lie upon; and'- the little amount oi' covering required on a bed-bottom constructed with these springs makes theui very cool and comfortable in warm weather. The peculiar shape in which the loops are bent causes the hottous construct-cd `of them to resume arounded and oval shape whenever released from pressure. y

What I claim as my invention, and desire to secure by Letters Patent, is-

The wire springs b b, constructed by bending the same into a. succession of loops, .as shown in the accompanying drawings, to be used in constructing the bottoms of beds, chairs, settees, sofas, and lounges.

A. H. KNAPP. [L s.]`

Witnesses:

L. W. WARREN, E. C. HARRINGTON. 

